Control device comprising a roller band cassette

ABSTRACT

The invention relates to a control device ( 1 ) for controlling airflows in motor vehicles, comprised of a frame having at least one passage opening ( 4 ) and at least one controlling means, which is provided in the form of a roller louver ( 5 ) and which serves to modify the passage cross-section for the air flowing through the passage opening ( 4 ). The frame comprises a housing ( 2 ) with at least two hollow bodies ( 8 ) that are open along the longitudinal sides. These hollow bodies ( 8 ) accommodate the drive shaft ( 6 ) or the return shaft ( 7 ) for the roller louver ( 5 ), and each have a pivotal cover ( 8.3 ) for opening the respective hollow body ( 8 ). The control device ( 1 ) can be mounted inside airflow ducts of a heating and/or air-conditioning system for motor vehicles.

The invention relates to a control device, in particular for a heatingand/or air conditioning system, for controlling air flows in motorvehicles, according to the precharacterizing clause of patent claim 1.

DE 44 42 000 A1 relates to a control device of this type for a heatingand/or air conditioning system which is designed as a louver cassetteand is inserted into air ducts of a heating and/or air conditioningsystem for a motor vehicle. The control device regulates the amount andalso the direction of the air flow passing through it. The controldevice is formed by a frame in which a multiplicity of pivotable slatswhich form a flap-type louver is arranged. Pivoting of the slats in arange of from 0 to 90° enables the passage cross section for the airflow to be completely closed, completely opened or partially opened up,the direction of the air flow also being influenced by the position ofthe slats. This louver cassette has a multiplicity of parts, caused bythe slat design and the activating means associated therewith. In thecase of narrow air gaps, whistling noises and possibly also rattlingnoises may occur. In addition, a louver cassette of this type has arelatively high air resistance, i.e. decrease of pressure.

DE 35 14 385 A1 has already disclosed replacing conventional flaps forcontrolling the air flows in a heating and/or air conditioning system bya “roller-type louver”. The latter comprises a roller band which ispartially provided with cutouts and closes or partially or completelyopens up the passage openings of air flow ducts. The roller band iswound up and unwound in a manner guided via individual rollers, and isbrought by means of a servomotor via a drive roller into a closing,opening or intermediate position.

EP 0 705 725 A1 has disclosed a development of a roller-type louver ofthis type. In this, a film-like roller band which has, distributed overits length, a multiplicity of different cutouts for the passage of anair flow is guided past the outlet openings of the air conditioningsystem housing and therefore controls the outlet cross section for theair. In a further application, a roller band of this type is arrangeddirectly in front of the heating element and controls the amount of airpassing through the heating element and the bypass flow flowing aroundthe heating element. This type of roller-type louver is adapted in eachcase to the specific installation conditions and configurations of aspecific heating and/or air conditioning system.

It is the object of the present invention to improve a control device,in particular for a heating and/or an air conditioning system, to theeffect that the control device has a minimal construction space, can beused universally and can be installed in a simple manner into theheating and/or air conditioning system, with it being possible for thecontrol device to be assembled in a simple manner.

This object is achieved according to the invention by the features ofclaim 1. The dependent claims relate to advantageous designs anddevelopments of the invention.

The main concept of the invention involves designing the frame of acontrol device for controlling air flows in motor vehicles in such amanner that the roller-type louver can be inserted into the frame andremoved therefrom in a simple manner. This is achieved by two hollowbodies which are open along the longitudinal side and accommodate thedrive shaft or the return shaft for the roller-type louver, the hollowbodies each having a pivotable cover for opening the particular hollowbody. The roller band of the roller-type louver is preferably designedin such a manner that it accommodates both shafts in the manner of anendless band. In this case, there can be a fixed connection between theroller band and shaft, in particular on the drive shaft, for example bythe roller band being attached fixedly to the shaft in some regions, inparticular being clamped in a manner such that it runs in thelongitudinal direction of the shaft.

In one advantageous embodiment, the pivotable cover is connected to thehollow body by means of a hinge, the hinge being designed, for example,as a film hinge.

In one particularly advantageous embodiment of the invention, at leastparts of the hollow body are integrally formed on the housing, the atleast one passage opening being arranged between the two hollow bodies.

In a further embodiment, the roller-type louver is connected fixedly tothe drive shaft, the drive shaft comprising, for example, at least twoparts between which the roller-type louver is clamped, the two partsbeing connected to each other by means of clipping or locking.

In one particularly advantageous embodiment of the invention, theroller-type louver is designed as an endless roller band with clearancesfor opening up the at least one passage opening.

In a preferred embodiment, the roller band is guided in two layers pastthe at least one passage opening, the clearances being distributed onthe roller band in such a manner that, when a passage opening is closed,each layer of the roller band covers approximately half of the passageopening, the passage opening being opened by the two layers of theroller band moving in opposite directions and opening up the passageopening from the center outward. The two-layered structureadvantageously avoids a fluttering of the band and, as a result, reducesthe production of noise. The described manner of opening up the passageopening means that only half of the actuating path is required foropening or closing the passage opening.

For better guidance and actuation of the roller band, the at least onepassage opening is divided by lattice bars into a plurality ofapertures.

The drive shaft is driven by means of a servomotor, which is, forexample, flanged directly onto the frame, or via a Bowden cable or aflexible shaft.

In another embodiment, the servomotor is integrated into the driveshaft, which is designed as a hollow shaft.

In a particularly advantageous embodiment of the invention, one frame isused to change two air flows, the frame comprising for this purpose twopassage openings, the passage cross sections of which are changed, inwhich, in a first starting position, a first passage opening iscompletely opened and a second passage opening is completely closed, inwhich, in a second starting position, the first passage opening iscompletely closed and the second passage opening is completely opened,and in which any desired passage cross sections for the particularpassage opening can be set between the first and the second startingposition. In this case, the passage openings may also be arranged atpredeterminable angles, for example of up to 90°, with respect to oneanother, as a function of the installation situation.

In one embodiment having two passage openings of the same size, the sumof the passage cross sections of the two passage openings alwaysproduces the maximum possible passage cross section of a passageopening.

For better guidance of the roller band in the case of a plurality ofpassage openings, the frame includes at least one supporting devicebetween two passage openings, the supporting device being connected,preferably releasably, for example to the two side parts and, as aresult, preventing a leakage from one passage opening to the otherpassage opening.

A particularly simple installation on the basis of a small number ofindividual parts and a simple insertion of the drive shaft and/or returnshaft arises if the hollow body is designed in such a manner that atleast one bearing point is provided in side walls of the hollow body, inwhich the drive shaft or the return shaft is mounted, in particular arespective half bearing being formed in side walls, both in the lowerpart and in the upper part, in each hollow body. However, it is alsopossible to form the bearing point completely in the upper part or inthe lower part.

The previously described control device is preferably used in heating orair conditioning systems for motor vehicles.

Exemplary embodiments of the invention are illustrated in the drawingand are described in more detail below.

In the drawing:

FIGS. 1 a-d show a control device having a roller-type louver forchanging one passage cross section;

FIGS. 2 a-d show a control device having a roller-type louver forchanging two passage cross sections;

FIG. 3 shows a sectional illustration of the control device according toFIG. 1 b;

FIG. 4 shows a sectional illustration of the control device according toFIG. 2 b;

FIGS. 5 a-b show a sectional illustration of the region of the returnshaft according to FIGS. 1 b and 2 b;

FIGS. 6 a-b show a sectional illustration of the drive shaft with theroller band;

FIGS. 7 a-c show various roller bands in a schematic illustration;

FIG. 8 shows an enlarged detail of the drive shaft with the roller band;

FIGS. 9 a-c show a sectional illustration of the control deviceaccording to FIG. 1;

FIGS. 10 a-c show a control device according to FIG. 2;

FIG. 11 shows an alternative embodiment of the control device forcontrolling two air flows;

FIGS. 12 a-d show an alternative embodiment of the control device;

FIGS. 13 a-c show a further embodiment; and

FIGS. 14 a-c show sections through various roller bands.

FIG. 1 shows a control device 1, having a frame which comprises ahousing 2 and two side parts 3. The housing encloses a passage opening 4which is divided by lattice bars 4.1 into a plurality of apertures 4.2.These lattice bars 14, which are arranged in parallel, serve tostrengthen the housing 3 and also to orient the air flow passing throughit. In the exemplary embodiment illustrated, on the longitudinal sides,a respective lower part 8.1 of a hollow body 8, which is open along onelongitudinal side, is integrally formed on the housing 2, the hollowbody in the exemplary embodiment illustrated being designed as a hollowcylinder, and the two hollow bodies 8 either accommodating a drive shaft6 or a return shaft 7. An upper part 8.3 is connected pivotably to thelower part 8.1 via a movable element 8.2. When the hollow body isopened, the roller-band subassembly, comprising a roller band 5, thedrive shaft 6 and the return shaft 7, can be inserted in a simple mannerfrom above into the housing 2. The upper part 8.3 is then pivoted ontothe lower part and the housing 3 is closed on its transverse sides bythe side parts 3.

The control means for changing the passage cross section of the passageopening comprise the endless roller band 5, the drive shaft 6 and thereturn shaft 7. The drive shaft 6 and the return shaft 7 are mountedrotatably in corresponding bearing points of the side parts 8, 9 bymeans of end-side pins or hollow pins (not illustrated specifically).The roller band 2 is guided over the circumference of the drive shaft 6and the return shaft 7. The roller band 2 has cutouts 5.1 whichcorrespond in their cross sections to that of the apertures 4.2 in thehousing 2. The cutouts 5.1 are divided by individual, narrow strips 5.2,so that in the roller band 2 the required tensile stress is maintainedover the entire width and an airtight contact of the roller band 2against the two shafts 6 and 7 is ensured.

FIGS. 1 a to 1 d show the individual parts of the control device 1 andthe sequence during the assembly of the control device 1. FIG. 1 a showsthe housing 3 with the upper part 8.3 of the hollow body 8 pivoted open.

FIG. 1 b shows the housing with the roller-band subassembly inserted init, the drive shaft and the return shaft being inserted into the twolower parts 8.1 of the hollow bodies.

FIG. 1 c shows the housing with the hollow body closed, i.e. the upperpart 8.3 has been pivoted onto the lower part via the moveable element,which is designed in the exemplary embodiment illustrated as a filmhinge, as a result of which the hollow body 8 is closed apart from alongitudinal slot 8.4 through which the roller band 5 is guided.

FIG. 1 d shows the control device with the housing 2 closed by the sideparts 3.

The control device described is inserted into a heating and/or airconditioning system (not illustrated here) for a motor vehicle, thecontrol device being adapted with regard to its external dimensions tothe particular air flow duct, so that the entire air flow cross sectioncan be controlled by the cassette. In the exemplary embodimentillustrated, the passage cross section of a passage opening 4 can becontrolled by five apertures 4.2.

FIG. 2 shows a control device 1 having a frame which comprises a housing2 and two side parts 3. In contrast to the exemplary embodiment in FIG.1, the housing here encloses two passage openings 4 which are divided bylattice bars 4.1 into a plurality of apertures 4.2. As is apparent fromFIG. 2, the control device, analogously to the control device accordingto FIG. 1, likewise comprises a housing 2 with hollow bodies 8integrally formed on it for accommodating the drive shaft 6 and thereturn shaft 7, and two side parts 3 and a roller band 5. In addition, asupporting device 9 for the additional guidance of the roller band 5 isarranged between the two passage openings 4. In the exemplary embodimentillustrated, the passage cross section can be controlled by two passageopenings 4. The illustration shows a first starting position in whichthe left passage opening is completely opened and the right passageopening is completely closed.

FIGS. 2 a to 2 d show the individual parts of the control device 1 forcontrolling two passage openings and the sequence during the assembly ofthe control device 1. FIG. 2 a shows the housing 3 with the upper part8.3 of the hollow body 8 pivoted open.

FIG. 2 b shows the housing with the roller-band subassembly (roller band5, drive shaft 6, return shaft 7) inserted and with a supporting device9 placed between the passage openings 4, the drive shaft 6 and thereturn shaft 7 being inserted into the two lower parts 8.1 of the hollowbodies 8.

FIG. 2 c shows the housing 2 with the hollow body 8 closed, i.e. theupper part 8.3 has been pivoted onto the lower part 8.1 via the moveableelement 8.2, which is designed in the exemplary embodiment illustratedas a film hinge, as a result of which the hollow body 8 is closed exceptfor a longitudinal slot 8.4 through which the roller band 5 is guided.

FIG. 2 d shows the control device with the housing 2 closed by the sideparts 3, the supporting device 9 likewise being connected, for exampleclipped, to the side parts.

FIG. 3 shows a sectional illustration of the control device 1 accordingto FIG. 1 b without a roller band 5, in order to illustrate the pivotingmovement 8.6 of the upper part 8.3 of the hollow body 8 about the pivotaxis 8.7 which runs approximately centrally through the moveable element8.2. As is apparent from FIG. 3, a lug 8.4 is integrally formed on theopen end of the upper part 8.3, the lug facilitating the guidance of theroller band 5 when the hollow body 8 is closed.

FIG. 4 shows a sectional illustration of the control device 1 accordingto FIG. 2 b with the roller-band subassembly (roller band 5, drive shaft6, return shaft 7) inserted and the supporting device 9 placed on it.

FIG. 5 shows a section through the region of the return shaft 7according to FIGS. 1 b and 2 b. FIG. 5 a shows the region with theroller-band subassembly inserted into the housing 2 and with the hollowbody opened. FIG. 5 b shows the region of the roller-band subassemblyinserted into the housing 2 and with the hollow body 8 closed. As isapparent from FIG. 5, the roller band 5 is guided in two layers 5.3, 5.4over the passage openings 4. The lug 8.4 which is integrally formed onthe upper part 8.3 of the hollow body facilitates the guidance of theroller band 5 through the longitudinal opening 8.5 of the hollow body 8.

FIG. 6 shows a schematic illustration of the connection of the rollerband 5 to the drive shaft 6. As is apparent from FIG. 6 a, the driveshaft 6 comprises a lower part 6.1 and an upper part 6.2, it beingpossible for the upper part 6.2 to be connected to the lower part 6.1 bymeans of a clip connection 6.3. For the connection to the drive shaft 6,at its ends the roller band has, for example, holes 5.5 through which itis fixed on the lower part 6.1 of the drive shaft 6. When the upper part6.2 is clipped to the lower part 6.1, the roller band is then clampedand, as a result, is connected fixedly to the drive shaft. Forclarification, FIG. 6 b shows an illustration of the lower part 6.1 ofthe drive shaft 6 with the corresponding clips 6.3 for the clipconnection to the upper part 6.2.

FIG. 7 shows various roller bands 5 in a schematic illustration. Thus,FIG. 7 a shows a roller band 5 for controlling two passage openings. Theroller band 5 has cutouts 5.1 which correspond with regard to theircross sections to that of the apertures 4.2 in the housing 2. Thecutouts 5.1 are divided by individual, narrow strips 5.2. The edges 5.6of the cutouts are preferably beveled in order to ensure that the tworoller-band layers easily run over one another. At the two ends, theroller band 5 has holes 5.5 for the fastening to the drive shaft 6.FIGS. 7 b and 7 c show roller bands for controlling a passage openinghaving a different number of apertures 4.1.

FIG. 8 shows an enlarged detail of the roller band 5 in the region ofthe drive shaft 6 corresponding to the illustration in FIGS. 1 d and 2d, the same reference numbers being used to a very great extent. As isapparent from FIG. 8, the roller band 5 is connected at its two endsfixedly to the drive shaft 6. The design of the roller band 5 as anendless band causes the formation of an upper layer 5.4 and a lowerlayer 5.3 which move in relation to each other when the drive shaft 6 isrotated. A suitable arrangement of cutouts therefore makes it possibleto open the passage openings from the center of the passage openingoutward or to close them from the outside to the center. The drive shaft6 is situated in the hollow body 8 of the housing 3, the hollow body 8having a slot 8.5 in the direction of the center of the housing. Theupper part 8.3 of the hollow body 8 merges into a resiliently designedlug or tongue 8.4 having a radius R, above which the roller band 5 isintroduced into the hollow body 8 and is led out of it again. Theendless roller band 5 has an upper layer 5.4 and a lower layer 5.3 whichmove in an opposed manner with respect to each other. The roller band 5loops around approx. ¾ of the circumference of the drive shaft 6 and istensioned by the resilient tongue 8.4. The tongue 8.4 therefore replacesa tensioning roller.

As further possibilities for the connection of the roller band 5 to thedrive shaft 6, the roller band 5 may also be fastened at its two ends tothe drive shaft 6 by the roller-band ends being welded to the driveshaft 6 in the longitudinal direction thereof. In the case of thedescribed fastenings to the drive shaft, the adjustment path for theroller band is dependent on the circumference of the drive shaft or onthe angle of wrap.

A further possibility for connecting the roller band 5 to the driveshaft 6 is explained in more detail with respect to FIGS. 13 a to 13 c.In this case, the drive shaft 6 is of two-part design with a lower part6.1 and an upper part 6.2, the two parts 6.1 and 6.2 being connectedintegrally to each other via two connecting webs 6.4, which basicallyhave a type of hinge function. The connecting webs 6.4 have anessentially rectangular cross section of 0.5 mm×2 mm and are formed byspray ducts, with a buckling point being provided approximatelycentrally. In this case, the connecting webs 6.4 are designed in such amanner that they are arranged in the interior of the drive shaft 6 whenthe two parts 6.1 and 6.2 are folded together.

The roller band 5 is in principle positioned in the abovementionedmanner by means of fixing pins 6.5 and is clamped between the two parts6.1 and 6.2 by means of snap hooks 6.6 (clip connection). The connectionof the two parts 6.1 and 6.2 takes place, as is apparent from FIG. 13 band FIG. 13 c (see the corresponding arrows in the figures) by means ofa combined pivoting/longitudinal movement, with essentially alongitudinal movement taking place for the clipping (cf. FIG. 13 c).With regard to the design of the roller band 5, reference is made toFIGS. 7 a to 7 c, in particular with regard to the holes 5.5 on the twoedges thereof.

The roller band 5 may be a single-layer film (monofilm), as illustratedin FIG. 14 a. A film of aluminum or a multilayered film having a layerof aluminum, as illustrated in FIGS. 14 b and 14 c, is particularlysuitable in particular with regard to a low heat conductivity. The layerof aluminum may be, for example, vapor-deposited or bonded on, ifappropriate also only in one region of the roller band. The roller band5 consists, in particular, of readily glidable, abrasion-resistantmaterial which is thermally stable in a region of from −40° C. to 100°C.

Furthermore, the roller band should be low in noise and water-repellent.The layer thicknesses may differ here.

FIGS. 9 a to 9 c show a sectional illustration of the control deviceaccording to FIG. 1 during the transition from a first starting position(passage opening closed) into a second starting position (passageopening opened) via an intermediate position (passage opening partiallyopened). As is apparent from FIG. 9, because of the use of the twolayers 5.3, 5.4 of the roller band 5, the roller band 5 requires ashorter adjustment path in order to bring the passage opening from theclosed starting position into the opened starting position, since eachlayer has to be moved only by an adjustment path which correspondsapproximately to half of the width A of the passage opening 4. For thispurpose, the drive shaft has to be rotated further through an angle ofapproximately 270°. It emerges from this that, in the case of theexemplary embodiment illustrated, ¾ of the circumference of the driveshaft or of the return shaft corresponds approximately to half of thewidth A of the passage opening.

FIGS. 10 a to 10 c show the control device according to FIG. 2 duringthe transition from a first starting position (left passage openingopened, right passage opening closed) into a second starting position(left passage opening closed, right passage opening opened) via anintermediate position (both passage openings partially opened). As isapparent from FIG. 10, opened apertures are closed from the outside tothe center and closed apertures are opened from the center to theoutside.

FIG. 11 shows an embodiment of the control device for controlling twoair flows which run at a predetermined angle with respect to oneanother. For this purpose, the two passage openings are arranged at thepredetermined angle with respect to each other. The angle is achieved bya corresponding design of the region between the two passage openings.

FIGS. 12 a to 12 d show an embodiment, in which bearing points 8.6 whichare integrated into the hollow bodies 8 are provided for the drive shaft6 and return shaft 7. In this case, regions which are cut out orrecessed in the form of a semicircle are provided in the lower part 8.1and upper part 8.3 on side walls 8.7 and form the bearing points 8.6. Inthis case, the side walls 8.7 can be of widened design in this region,so that the material is subjected to a lower loading. A side part 3which is placed on, as illustrated, for example, in FIG. 1 a, can beomitted, since the two side walls 8.7, which are formed on the housing 2with lower parts and upper parts 8.1 and 8.3, take on the functionthereof.

The two shafts are inserted together with the roller band 5 into thelower bearing points 8.6 in the direction of the two arrows of FIG. 12d. The upper parts 8.3 are then pivoted shut, so that the upper bearings8.6 come into contact with the shafts. The locking of lower and upperpart takes place by means of a clip connection 8.8 which is provided onthe side walls 8.7, as can be gathered in particular from FIG. 12 d. Forthe positioning and improved transmission of force in the radialdirection of the side walls 8.7 with respect to the bearing points 8.6,a lug 8.9 is provided on the side walls 8.7 of the upper part 8.3 and,during the closing process, passes into a corresponding receptacle 8.10which is formed on the side walls 8.7 of the lower part 8.1.

1. A control device (1) for controlling air flows in motor vehicles,comprising a frame having at least one passage opening (4) and at leastone controlling means, which is designed as a roller-type louver (5),for changing the passage cross section for the air flowing through thepassage opening (4), characterized in that the frame comprises a housing(2) with at least two hollow bodies (8) which are open along thelongitudinal sides, the hollow bodies (8) accommodating the drive shaft(6) or the return shaft (7) for the roller-type louver (5), the hollowbodies (8) each having a pivotable cover (8.3) for opening theparticular hollow body (8).
 2. The control device (1) as claimed inclaim 1, characterized in that the pivotable cover (8.3) is connected tothe hollow body (8.1) by means of a moveable element (8.2).
 3. Thecontrol device (1) as claimed in claim 2, characterized in that themoveable element (8.2) is designed as a film hinge.
 4. The controldevice (1) as claimed in claim 1, characterized in that at least parts(8.1) of the hollow bodies (8) are integrally formed on the housing (2).5. The control device (1) as claimed in claim 1, characterized in thatthe at least one passage opening (4) is arranged between the two hollowbodies (8).
 6. The control device (1) as claimed in claim 1,characterized in that the roller-type louver (5) is connected fixedly tothe drive shaft (6).
 7. The control device (1) as claimed in claim 6,characterized in that the drive shaft (6) comprises at least two parts(6.1 and 6.2), the roller-type louver (5) being clamped or weldedbetween these two parts (6.1 and 6.2).
 8. The control device (1) asclaimed in claim 7, characterized in that the two parts (6.1 and 6.2)are connected to each other by means of clipping or locking.
 9. Thecontrol device (1) as claimed in claim 1, characterized in that thehousing (2) is closed laterally by a respective side part (3).
 10. Thecontrol device (1) as claimed in claim 1, characterized in that theroller-type louver (5) is designed as an endless roller band (5) havingopenings or cutouts (5.1) for opening at the passage cross section (4).11. The control device (1) as claimed in claim 1, characterized in thatthe roller band (5) is guided in two layers past the at least onepassage opening (4), openings or cutouts (5.1) being distributed on theroller band (5) in such a manner that, when a passage opening (4) isclosed, each layer (5.3, 5.4) of the roller band (5) coversapproximately half of the passage opening (4), the passage opening (4)being opened by the two layers (5.3, 5.4) of the roller band (5) movingin opposite directions and opening up the passage opening (4) from thecenter outward.
 12. The control device (1) as claimed in claim 1,characterized in that edges (5.6) of openings or cutouts (5.1) of theroller band (5) are beveled.
 13. The control device (1) as claimed inclaim 1, characterized in that the at least one passage opening (4) isdivided by lattice bars (4.2) into a plurality of apertures (4.1). 14.The control device (1) as claimed in claim 1, characterized in that thepassage cross section can be enlarged from the center of an associatedpassage opening (4) outward on both sides and can be reduced in sizefrom the outside to the center on both sides.
 15. The control device (1)as claimed in claim 1, characterized in that the drive shaft (6) isdriven via Bowden cable or a flexible shaft.
 16. The control device (1)as claimed in claim 1, characterized in that a servomotor for adjustingthe drive shaft (6) is flanged onto the frame.
 17. The control device(1) as claimed in claim 16, characterized in that the servomotor isarranged coaxially with the drive shaft (6).
 18. The control device (1)as claimed in claim 16, characterized in that the servomotor isintegrated into the drive shaft (6), which is designed as a hollowshaft.
 19. The control device (1) as claimed in claim 1, characterizedin that the frame comprises two passage openings (4), an air flow beingchanged in each case by a change in the passage cross section of theparticular passage opening (4).
 20. The control device (1) as claimed inclaim 19, characterized in that, in a first starting position, a firstpassage opening (4) is completely opened and a second passage opening(4) is completely closed.
 21. The control device (1) as claimed in claim19, characterized in that, in a second starting position, the firstpassage opening (4) is completely closed and the second passage opening(4) is completely opened.
 22. The control device (1) as claimed in claim19, characterized in that any desired passage cross sections for theparticular passage opening (4) can be set between the first and thesecond starting position.
 23. The control device (1) as claimed in claim22, characterized in that, when the passage openings (4) are the samesize, the sum of the passage cross sections of the two passage openings(4) always produces the maximum possible passage cross section of apassage opening (4).
 24. The control device (1) as claimed in claim 1,characterized in that the frame includes at least one supporting device(9) between two passage openings (4).
 25. The control device (1) asclaimed in claim 24, characterized in that the at least one supportingdevice (9) is connected, preferably releasably, to the two side parts(3).
 26. The control device (1) as claimed in claim 1, characterized inthat at least one bearing point (8.6) is provided in side walls (8.7) ofthe hollow body (8), in which the drive shaft (6) or the return shaft(7) is mounted.
 27. The control device (1) as claimed in claim 26,characterized in that the at least one bearing point (8.6) is oftwo-part design and in each case one part is arranged in the upper partand one part in the lower part of the side wall (8.7) of the hollow body(8).
 28. The control device (1) as claimed in claim 26, characterized inthat the at least one bearing point (8.6) is of single-part design andis arranged completely in the side wall (8.7) of the hollow body (8).29. A heating or air conditioning system having a control device (1) asclaimed in claim 1.